JPH05190383A - Manufacture of lc noise filter - Google Patents

Abstract

PURPOSE:To improve the stability of the capacitance of a noise filter and a product yield by separating a dielectric film with folds at a given length, and by folding up the film by means of an application device. CONSTITUTION:Conductor foil 2 is formed on both sides of a dielectric film 1. This foil is formed into conductor patterns 3 and 4 in the shape of a rectangular tooth by etching. An insulating film is then formed on the surface of these conductor patterns 3 and 4. The dielectric film 1 thus prepared is then successively subjected, from its one end to the other end, to a folding machine to make folds in such a manner that angled portions of the rectangular toothlike conductor patterns 3 and 4 are alternated with each other. The dielectric film 1 with these folds is cut at a predetermined length, and the film separated is folded by an application device to produce an LC noise filter. Hence, a mass production of this LC noise filter can be carried out by making conductor patterns in a plurality of lines by etching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an LC noise filter that suppresses electromagnetic waves generated from electronic circuits, for example.

[0002]

2. Description of the Related Art Recently, a small and inexpensive LC noise filter has been proposed which can surely remove intruding noise without causing ringing.

This noise filter is of a folding type, and as shown in FIG. 6, a rectangular tooth-shaped first conductor 102 is attached to one side of a first insulating sheet 101, and a second tooth
The second conductor 1 having a rectangular tooth shape on one side of the insulating sheet 103 of
04, and both insulating sheets 101, 103
Is further folded and laminated (see FIG. 7) such that the bent portions of the rectangular tooth-shaped portions of the conductors 102 and 104 are displaced alternately (see FIG. 7), thereby forming the LC noise filter (see FIG. 8) 105. The conductor 102 functions as a coil having a predetermined number of turns, and the second conductor 104 forms a capacitance with the first conductor 102.

Conventionally, when manufacturing the above-mentioned LC noise filter, a conductor foil (for example, Cu foil) is punched and formed in a predetermined pattern, and thereafter, the conductor patterns are respectively insulated as described above. I tried to put what was attached to the sheet on top of each other.

[0005]

However, according to the above-mentioned conventional manufacturing method, it is necessary to stack two insulating sheets to which conductors each formed in a predetermined pattern are attached.
There is a problem in that sufficient accuracy cannot be obtained to match the conductor patterns with each other and the individual production method is not suitable for mass production.

Therefore, the present invention can solve the above-mentioned problems.
It is an object to provide a method for manufacturing a C noise filter.

[0007]

In order to solve the above problems, a method for manufacturing an LC noise filter according to the present invention comprises forming conductor foils on both sides of an insulating film, and then etching these conductor foils to form rectangular tooth-like shapes. Conductor patterns are formed, then insulating films are formed on the surfaces of these conductor patterns, and then the insulating film thus formed is sequentially subjected to a conductor pattern by a crease imparting device from one end side to the other end side. In this method, folds are provided so that the bent portions of the rectangular tooth-like portions are alternately displaced, and then the insulating film provided with the folds is cut with a predetermined length and then folded by a crimping device.

[0008]

According to the above construction, since the rectangular tooth-shaped conductors are formed by etching when they are provided on both sides of the insulating film, compared with the conventional case where two conductors are bonded together, The accuracy of matching patterns is very good, and it is suitable for mass production. Also,
Since the folds are provided by the fold-providing device to the insulating film having the conductor patterns formed on both sides, it is possible to fold easily and accurately.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The LC noise filter according to the present invention is a laminated state in which two conductor patterns each having a rectangular tooth shape are formed on both surfaces of an insulating film and are folded so that the bent portions of the rectangular tooth portions of each conductor are alternately displaced. By
A three-terminal type LC noise filter is obtained, one conductor functions as a coil having a predetermined number of turns, and the other conductor constitutes a capacitance with the one conductor.

The manufacturing method of the LC noise filter will be described below. First, as shown in FIG. 1A, conductor foils (for example, Cu foils) 2 are adhered to the front and back surfaces of the insulating film 1, and the conductor foils 2 on the front and back surfaces are etched to obtain
As shown in (b) and (c), a rectangular tooth-shaped first conductor pattern 3 and a second conductor pattern 3 are formed.

The first conductor pattern 3 is for a capacitor, and the second conductor pattern 4 is for an inductor. In general, the insulating film 1 is formed continuously and in a large number of rows with the conductor patterns 3, 4 described above.
2A is formed, the insulating film 1 on which the insulating patterns 3 and 4 formed on the roll 11 have been formed is sequentially drawn out at the time of manufacturing, and the crease imparting device 12 causes the conductor to be formed. After the creases are provided so that the bent portions of the rectangular tooth-shaped portions of the patterns 3 and 4 are alternately displaced, as shown in FIG. 2B, the cutting device 13 cuts at a predetermined position, and as shown in FIG. The folding member 5 as shown in c) is formed. Of course, the cut ends of the conductor patterns 3 and 4 are cut at positions where they will become the terminal portions 3a, 4a, and 4b, as shown in FIGS. 1B and 1C. It is also possible to leave a dummy portion when cutting each of the conductor patterns 3 and 4, and cut at a predetermined terminal portion position during manufacturing.

Next, as shown in FIG. 3, the folding member 5 is heated and pressed by the thermocompression bonding device 14 to crimp the folded portion. It should be noted that when the thermal adhesive is applied, the thermocompression bonding process is performed in this manner, but when the adhesive is applied, heating is not necessary.

Next, the folding member 5 is shown in FIGS.
As shown in (d), the ends thereof are respectively folded back in a predetermined direction, and the three terminal portions 3a, 4a, 4b are located on the same plane. The end portions on the 3a and 4a sides are folded back twice to expose both terminal portions 3a and 4a. That is,
In the first folding, the terminal portion 4a of the second conductor pattern 4 is exposed, and by folding in the opposite direction, the terminal portion 3a of the first conductor pattern 3 on the opposite surface is the terminal of the second conductor pattern 4. It is exposed on the portion 4a. Of course, this 2
At the time of folding back the second time, that is, when the terminal portion 3a of the first conductor pattern 3 is folded back onto the terminal portion 4a of the second conductor pattern 4, a part of the terminal portion 4a of the second conductor pattern 4 is exposed. It is folded back as shown in FIG. 4 (d).

Then, in this way, the respective terminal portions 3a, 4a,
The folding member 5 having the exposed 4b is cut at the boundary A of each row as shown in FIG. 5 (a) to obtain each folding piece 6 as shown in FIG. 5 (b).

Thereafter, although not shown, the folding piece 6 is formed.
After arranging the electrodes corresponding to the respective terminal portions 3a, 4a, 4b, and housing them one by one in the case, an LC noise filter can be obtained.

Thus, when the rectangular tooth-shaped conductor patterns are provided on both sides of the insulating film, the conductor patterns are formed by etching. Therefore, compared to the conventional case where two conductors are bonded together, the pattern is formed. The accuracy of matching each other is greatly improved.

Further, since the insulating film having conductor patterns formed on both sides is crimped by the crimping device after the creases are made by the crease-providing device, it can be folded easily and accurately.

In the above embodiment, the insulating film having a predetermined width is folded and cut into individual pieces, but of course, the cutting pitch is increased so that a plurality of pieces are continuous. Thus, the network type LC noise filter provided can be manufactured.

[0019]

As described above, according to the method for manufacturing the LC noise filter of the present invention, when the rectangular tooth-shaped conductor patterns are provided on both surfaces of the insulating film, they are formed by etching. Compared to the case where two conductors are bonded together, the accuracy of matching the patterns becomes very good, so that the stability of the capacitor capacity of the noise filter is improved and the product yield is improved. Also, on the insulating film with conductor patterns formed on both sides,
Since the crimping device presses the creases and then the crimping device presses the folds, the folds can be folded easily and accurately. Furthermore, in this manufacturing method, if the conductor patterns are formed in a plurality of rows by etching, mass production can be performed.

[Brief description of drawings]

1A and 1B show constituent members of an LC noise filter according to an embodiment of the present invention, in which FIG. 1A is a perspective view, and FIGS. 1B and 1C are plan views of conductor patterns.

FIG. 2 is a process drawing for explaining the manufacturing method of the LC noise filter in the example.

FIG. 3 is a process drawing for explaining the manufacturing method of the LC noise filter in the example.

FIG. 4 is a process diagram illustrating the method of manufacturing the LC noise filter in the example.

FIG. 5 is a process drawing for explaining the manufacturing method of the LC noise filter in the example.

FIG. 6 is an exploded perspective view of a conductor and an insulating sheet that form an LC noise filter in a conventional example.

FIG. 7 is a perspective view showing a manufacturing procedure of an LC noise filter in a conventional example.

FIG. 8 is an external perspective view of an LC noise filter in a conventional example.

[Explanation of symbols]

 1 Insulation Filter 2 Conductor Foil 3 First Conductor Pattern 3a Terminal Part 4 Second Conductor Pattern 4a, 4b Terminal Part 5 Folding Member 6 Folding Element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsumi Ohba 5-3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. 2-chome, Hitachi Shipbuilding Co., Ltd. (72) Inventor Takeshi Ikeda 2-chome, 5-chome, Sanno, 2-chome, Ota-ku, Tokyo

Claims (1)

[Claims] 1. A conductor foil is formed on both sides of an insulating film, and then these conductor foils are etched to form rectangular tooth-shaped conductor patterns. Next, an insulating film is formed on the surfaces of these conductor patterns. The insulating film formed as described above is provided with folds in such a manner that the bent portions of the rectangular tooth-shaped portions of the conductor pattern are alternately displaced by the fold-providing device in order from the one end side to the other end side. A method of manufacturing an LC noise filter, comprising: cutting an insulating film having a fold line with a predetermined length and then folding the insulating film with a pressure bonding device.